Hey Jonathan,
I investigated a bit the Cassandra failure I am seeing.
The logs based on a code change I did are here
https://gist.github.com/emmanuelbernard/13d22d15dc983a83a7e2
My understanding is that the failing type is the TrueFalseType used on
Bookmark.isPrivate. This type returns a F char for false.
The commit is recent a2b310 (yesterday).
Emmanuel